diff --git a/validation/groups.rst b/validation/groups.rst
index 51981375e0e..35f2fb4a7e6 100644
--- a/validation/groups.rst
+++ b/validation/groups.rst
@@ -173,6 +173,10 @@ as the third argument to the ``validate()`` method::
 If no groups are specified, all constraints that belong to the group ``Default``
 will be applied.
 
+You can use the special group name ``*`` to validate against all constraints in all groups::
+
+    $errors = $validator->validate($author, null, ['*']);
+
 In a full stack Symfony project, you'll usually work with validation indirectly
 through the form library. For information on how to use validation groups inside
 forms, see :doc:`/form/validation_groups`.